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銀河の合併で多層のガス流入によって超大質量ブラックホールが直接形成される
L Mayer1, S Kazantzidis, A Escala
1Institute for Theoretical Physics, University of Zürich, 190 Winterthurestrasse, Zürich 8057, Switzerland. lmayer@physik.unizh.ch
Nature
|August 27, 2010
まとめ
巨大な原銀河の合併は,自然に超大質量ブラックホールを形成することができます. これらの合併は,直接的なガス崩壊の条件を作り出し,抑制された恒星形成の必要性を回避し,ブラックホールの急速な成長を可能にします.
科学分野:
- 天体物理学 天体物理学
- コスモロジー・コスモロジーとは
- ブラックホール形成.
背景:
- 数十億の太陽質量を持つ超大質量ブラックホール (SBH) は,ビッグバンから10億年未満の宇宙の初期に存在していました.
- 原始的な星の崩壊や孤立したプロト銀河の直接的な崩壊を含む以前のモデルは,これらの初期のSBHの急速な形成と成長を,非効率的なガス蓄積または厳しい環境要件のために説明するのに苦労しました.
研究 の 目的:
- 超大質量ブラックホールの急速な形成のための新しいメカニズムを調査するために.
- 原銀河の合併が,抑制された冷却や恒星形成を必要とせずに,自然に巨大なブラックホールへの直接的な崩壊を容易にするかどうかを決定する.
主な方法:
- 巨大な原銀河の融合の数値シミュレーション.
- 核融合による核ガスディスク内のガスダイナミクス,蓄積率,重力崩壊の分析.
主要な成果:
- 原銀河の合併は自然に不安定で巨大な核ガスの円盤を生み出します.
- これらの円盤は,大量のガス (108太陽質量以上) を10万年以内にパーセック以下スケールに効率的に運びます.
- この急速なガス濃度が重力崩壊を引き起こし,巨大なブラックホールシードを形成します.
結論:
- 合併によるガスの流入は,直接的な崩壊のための実行可能な経路を提供し,エキゾチックな条件なしにSBHの種を形成します.
- シミュレートされたメカニズムは,初期の宇宙で観察されたSBHの急速な出現を説明します.
- これらの種子への後の蓄積は,108年以内に10億太陽質量のブラックホールにつながる可能性があります.
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